#pragma once

#include <iostream>
#include <string>
#include <list>
#include <memory>
#include <algorithm>
#include <sys/types.h>
#include <sys/socket.h>

#include "InetAddr.hpp"
#include "Log.hpp"
#include "Mutex.hpp"

using namespace LogModule;
using namespace LockModule;

class UserInterface
{
public:
    virtual ~UserInterface() = default;
    virtual void SendTo(int sockfd, const std::string& message) = 0;
    virtual  bool operator == (const InetAddr& u) = 0;
    virtual  std::string Id() = 0;
};

class User : public UserInterface
{
public:
    User(const InetAddr id)
        :_id(id)
    {}
    void SendTo(int sockfd, const std::string& message) override
    {
        LOG(LogLevel::DEBUG) << "send message to " << _id.Addr() << " info: " << message;
        int n = ::sendto(sockfd, message.c_str(), message.size(), 0, _id.NetAddr(), _id.NetAddrLen());
        if(n > 0)
            LOG(LogLevel::DEBUG) << "message send success";
        else
            LOG(LogLevel::ERROR) << "message send error";
    }
    bool operator == (const InetAddr& u) override
    {
        return _id == u;
    }
    std::string Id()
    {
        return _id.Addr();
    }
    ~User()
    {}
private:
    InetAddr _id;
};

//对用户消息进行路由
//Router把所有的用户管理起来
//观察者模式 observer
class UserManager
{
public:
    UserManager()
    {

    }
    void AddUser(InetAddr& id)
    {
        LockGuard lockguard(_mutex);
        for(auto& user : _online_user) //因为要遍历所有人，所以微信QQ的群聊人数有数量限制！
        {
            if(*user == id)
            {
                LOG(LogLevel::INFO) << id.Addr() << "用户已经存在";
                return;
            }
        }
        LOG(LogLevel::INFO) << "新增该用户： " << id.Addr();
        _online_user.push_back(std::make_shared<User>(id));
        PrintUser();
    }
    void DelUser(InetAddr& id)
    {
        //v1
        auto pos = std::remove_if(_online_user.begin(),_online_user.end(),[&id](std::shared_ptr<UserInterface> &user){
            return *user == id;
        });
        _online_user.erase(pos, _online_user.end());    
        PrintUser();

        //v2
        // for(auto& user : _online_user)
        // {
        //     if(*user == id)
        //     {
        //         _online_user.erase(*user);
        //         break; //迭代器失效的问题
        //     } 
        // }
    }
    //路由
    void Router(int sockfd, const std::string& message)
    {
        LockGuard lockguard(_mutex);
        for(auto& user : _online_user)
        {
            user->SendTo(sockfd, message);
        }
    }
    void PrintUser()
    {
         for(auto& user : _online_user)
        {
            LOG(LogLevel::DEBUG) << "在线用户-> " << user->Id();
        }
    }
    ~UserManager()
    {
        
    }
private:
    std::list<std::shared_ptr<UserInterface>> _online_user;
    Mutex _mutex;
};